If you’re a crayfish, location is everything. In North America, times are tough for the mini crustaceans. Habitat destruction, damming and pollution have decimated local populations, such that many species are in dire need of help. But when some of the same species were exported to Europe, they found a much more favorable environment and are thriving. A little too much — American expats bully European crayfish and spread disease, driving many local species to the brink.
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Crayfish map gives helping claw
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Lacunicambarus polychromatus, the paintedhand mudbug, is an Illinois native crayfish.
The spread is shown of invasive Procambarus clarkii, the red swamp crayfish, in western Europe -- hexagons -- and the associated crayfish path…